The chemical symbol for Rubidium is Rb and its atomic number is 37.
We find it listed in the periodic table of elements in group 1 and period 5 and block s.
Rubidium belongs to the family or chemical series of alkali metals.
This element is stable, Rubidium came from rubidus.
Atomic number (Z) 37
Group, block group 1 (alkali metals), s-block
Period: period 5
Element category: alkali metal
Standard atomic weight (±) (Ar): 85.4678(3)[1]
Electron configuration: [Kr] 5s1
per shell 2, 8, 18, 8, 1
Physical properties:
Phase: solid
Melting point: 312.45 K (39.30 °C, 102.74 °F)
Boiling point: 961 K (688 °C, 1270 °F)
Density near r.t.: 1.532 g/cm3
when liquid, at m.p. 1.46 g/cm3
Triple point: 312.41 K, ? kPa[2]
Critical point: 2093 K, 16 MPa (extrapolated)[2]
Heat of fusion: 2.19 kJ/mol
Heat of vaporization: 69 kJ/mol
Molar heat capacity :31.060 J/(mol•K)
Atomic properties:
Oxidation states: +1, −1 (a strongly basic oxide)
Electronegativity: Pauling scale: 0.82
Ionization energies: 1st: 403 kJ/mol
2nd: 2632.1 kJ/mol
3rd: 3859.4 kJ/mol
Atomic radius empirical: 248 pm
Covalent radius: 220±9 pm
Van der Waals radius: 303 pm
Crystal structure: body-centered cubic
Speed of sound thin rod: 1300 m/s (at 20 °C)
Thermal expansion: 90 µm/(m•K)[3] (at r.t.)
Thermal conductivity: 58.2 W/(m•K)
Electrical resistivity: 128 nΩ•m (at 20 °C)